Light inside heavy flint glass ((n=1.66) ) is incident on a flat glass–air boundary…
PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
Light inside heavy flint glass (n=1.66) is incident on a flat glass–air boundary at exactly the critical angle. Which outcome is most consistent with this condition?
(a) All the light is internally reflected back into the glass at the same angle as incidence.
(b) The refracted ray travels along the interface, making a 90∘ angle with the normal in the air.
(c) The refracted ray enters the air along the normal, making a 0∘ angle with the normal.
(d) The refracted ray emerges in the air making about 37∘ with the normal.